/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2019 Michal Meloun <mmel@FreeBSD.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/gpio.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/malloc.h>
#include <sys/rman.h>

#include <machine/bus.h>

#include <dev/hwreset/hwreset.h>
#include <dev/phy/phy_usb.h>
#include <dev/regulator/regulator.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>

#include <dev/fdt/simple_mfd.h>
#include "phynode_if.h"
#include "phynode_usb_if.h"

static struct ofw_compat_data compat_data[] = {
        {"qcom,usb-ss-ipq4019-phy",     1},
        {NULL,                          0},
};

struct ipq4018_usb_ss_phy_softc {
        device_t                dev;
};

struct ipq4018_usb_ss_phynode_sc {
        struct phynode_usb_sc   usb_sc;
        int                     mode;
        hwreset_t               por_rst;
};

static int
ipq4018_usb_ss_phynode_phy_enable(struct phynode *phynode, bool enable)
{
        struct ipq4018_usb_ss_phynode_sc *sc;
        device_t dev;
        int rv;

        dev = phynode_get_device(phynode);
        sc = phynode_get_softc(phynode);

        /*
         * For power-off - assert por, sleep for 10ms
         */
        rv = hwreset_assert(sc->por_rst);
        if (rv != 0)
                goto done;
        DELAY(10*1000);

        /*
         * For power-on - power off first, then deassert por.
         */
        if (enable) {
                rv = hwreset_deassert(sc->por_rst);
                if (rv != 0)
                        goto done;
                DELAY(10*1000);
        }

done:
        if (rv != 0) {
                device_printf(dev, "%s: failed, rv=%d\n", __func__, rv);
        }
        return (rv);
}

 /* Phy controller class and methods. */
static phynode_method_t ipq4018_usb_ss_phynode_methods[] = {
        PHYNODEUSBMETHOD(phynode_enable,        ipq4018_usb_ss_phynode_phy_enable),
        PHYNODEUSBMETHOD_END
};
DEFINE_CLASS_1(ipq4018_usb_ss_phynode, ipq4018_usb_ss_phynode_class,
    ipq4018_usb_ss_phynode_methods,
    sizeof(struct ipq4018_usb_ss_phynode_sc), phynode_usb_class);

static int
ipq4018_usb_ss_usbphy_init_phy(struct ipq4018_usb_ss_phy_softc *sc,
    phandle_t node)
{
        struct phynode *phynode;
        struct phynode_init_def phy_init;
        struct ipq4018_usb_ss_phynode_sc *phy_sc;
        int rv;
        hwreset_t por_rst = NULL;

        /* FDT resources */
        rv = hwreset_get_by_ofw_name(sc->dev, node, "por_rst", &por_rst);
        if (rv != 0 && rv != ENOENT) {
                device_printf(sc->dev, "Cannot get 'por_rst' reset\n");
                goto fail;
        }

        /* Create and register phy. */
        bzero(&phy_init, sizeof(phy_init));
        phy_init.id = 1;
        phy_init.ofw_node = node;
        phynode = phynode_create(sc->dev, &ipq4018_usb_ss_phynode_class,
            &phy_init);
        if (phynode == NULL) {
                device_printf(sc->dev, "Cannot create phy.\n");
                return (ENXIO);
        }

        phy_sc = phynode_get_softc(phynode);
        phy_sc->por_rst = por_rst;

        if (phynode_register(phynode) == NULL) {
                device_printf(sc->dev, "Cannot register phy.\n");
                return (ENXIO);
        }

        (void) ipq4018_usb_ss_phynode_phy_enable(phynode, true);

        return (0);

fail:
        if (por_rst != NULL)
                 hwreset_release(por_rst);

        return (ENXIO);
}

static int
ipq4018_usb_ss_usbphy_probe(device_t dev)
{

        if (!ofw_bus_status_okay(dev))
                return (ENXIO);

        if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
                return (ENXIO);

        device_set_desc(dev, "IPQ4018/IPQ4019 USB SS PHY");
        return (BUS_PROBE_DEFAULT);
}

static int
ipq4018_usb_ss_usbphy_attach(device_t dev)
{
        struct ipq4018_usb_ss_phy_softc *sc;
        phandle_t node;
        int rv;

        sc = device_get_softc(dev);
        sc->dev = dev;
        node = ofw_bus_get_node(sc->dev);

        rv = ipq4018_usb_ss_usbphy_init_phy(sc, node);
        if (rv != 0)
                goto fail;
        bus_attach_children(dev);
        return (0);

fail:
        return (ENXIO);
}

static int
ipq4018_usb_ss_usbphy_detach(device_t dev)
{

        return (0);
}

static device_method_t ipq4018_usb_ss_usbphy_methods[] = {
        /* Device interface */
        DEVMETHOD(device_probe,                 ipq4018_usb_ss_usbphy_probe),
        DEVMETHOD(device_attach,                ipq4018_usb_ss_usbphy_attach),
        DEVMETHOD(device_detach,                ipq4018_usb_ss_usbphy_detach),
        DEVMETHOD_END
};

static DEFINE_CLASS_0(ipq4018_usb_ss_usbphy, ipq4018_usb_ss_usbphy_driver,
    ipq4018_usb_ss_usbphy_methods,
    sizeof(struct ipq4018_usb_ss_phy_softc));
EARLY_DRIVER_MODULE(ipq4018_usb_ss_usbphy, simplebus,
    ipq4018_usb_ss_usbphy_driver, NULL, NULL,
    BUS_PASS_TIMER + BUS_PASS_ORDER_LAST);